12.04 64-bit Wubi cannot find root file system after normal restart

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http://askubuntu.com – I have seen this question asked elsewhere, and originally I was going to post my question in one of those threads. But the forum rules popped up and told me that I'm only supposed to answer the original question in a reply, rather than asking for help. Which means that to ask my question, I need to start my own thread (which seems redundant). I saw this question asked for 10.10 and 11.04, in this thread: Root filesystem check fails after power failure during installation I also saw this one, which looks specifically Wubi-related: WUBI - No root system file defined I'm having the same proble (HowTos)